Surface unit for downhole pump

A surface pumping system for actuating a subsurface pump in a wellbore, the system comprising:

• a power side comprising a circulating tank, a motorized pump, and a power fluid control valve, wherein the motorized pump conveys a power fluid from the circulating tank to the power fluid control valve, and wherein the power fluid control valve conveys the power fluid back to the circulating tank when the power fluid control valve is open, or conveys the power fluid into production tubing located within the wellbore when the power fluid control valve is closed;
• and
• an extraction side comprising a balance tank, wherein the balance tank contains production fluid and pressurized gas, wherein the balance tank receives production fluid through an inner tubing concentric to the production tubing located within the wellbore;
• and
• wherein the power side actuates the subsurface pumping device by closing the power fluid control valve, conveying power fluid down into the production tubing until the pressure change actuates the subsurface pump, which in turn conveys production fluid up the inner tubing and into the balance tank, raising the balance tank's production fluid level and pressurizing the gas, and then opening the power fluid control valve, allowing the de-pressurized power fluid to flow back into the circulating tank and the pressurized gas in the balance tank to push the production fluid out of the balance tank, down through the inner tubing actuating the subsurface pump, causing the power fluid to return up through the production tubing through the power fluid control valve back into the circulating tank.